/*
 * Copyright 2001 Niels Provos <provos@citi.umich.edu>
 * All rights reserved.
 *
 * This header file contains definitions for dealing with HTTP requests
 * that are internal to libevent.  As user of the library, you should not
 * need to know about these.
 */

#ifndef _HTTP_H_
#define _HTTP_H_

#define HTTP_CONNECT_TIMEOUT	45
#define HTTP_WRITE_TIMEOUT	50
#define HTTP_READ_TIMEOUT	50

#define HTTP_PREFIX		"http://"
#define HTTP_DEFAULTPORT	80

enum evhttp_connection_error
{
  EVCON_HTTP_TIMEOUT,
  EVCON_HTTP_EOF,
  EVCON_HTTP_INVALID_HEADER
};

struct evbuffer;

struct addrinfo;

struct evhttp_request;

/* A stupid connection object - maybe make this a bufferevent later */

enum evhttp_connection_state
{
  EVCON_DISCONNECTED,	/* not currently connected not trying either */
  EVCON_CONNECTING,	/* tries to currently connect */
  EVCON_CONNECTED		/* connection is established */
};

struct event_base;

struct evhttp_connection
  {
    /* we use tailq only if they were created for an http server */
    TAILQ_ENTRY (evhttp_connection) (next);

    int fd;

    struct event ev;

    struct event close_ev;

    struct evbuffer *input_buffer;

    struct evbuffer *output_buffer;

    char *bind_address;		/* address to use for binding the src */

    char *address;			/* address to connect to */
    u_short port;

    int flags;
#define EVHTTP_CON_INCOMING	0x0001	/* only one request on it ever */
#define EVHTTP_CON_OUTGOING	0x0002  /* multiple requests possible */
#define EVHTTP_CON_CLOSEDETECT  0x0004  /* detecting if persistent close */

    int timeout;			/* timeout in seconds for events */
    int retry_cnt;			/* retry count */
    int retry_max;			/* maximum number of retries */

    enum evhttp_connection_state state;

    /* for server connections, the http server they are connected with */

    struct evhttp *http_server;

    TAILQ_HEAD (evcon_requestq, evhttp_request) requests;

    void (*cb) (struct evhttp_connection *, void *);
    void *cb_arg;

    void (*closecb) (struct evhttp_connection *, void *);
    void *closecb_arg;

    struct event_base *base;
  };

struct evhttp_cb
  {
    TAILQ_ENTRY (evhttp_cb) next;

    char *what;

    void (*cb) (struct evhttp_request *req, void *);
    void *cbarg;
  };

/* both the http server as well as the rpc system need to queue connections */
TAILQ_HEAD (evconq, evhttp_connection);

struct evhttp
  {

    struct event bind_ev;

    TAILQ_HEAD (httpcbq, evhttp_cb) callbacks;

    struct evconq connections;

    int timeout;

    void (*gencb) (struct evhttp_request *req, void *);
    void *gencbarg;

    struct event_base *base;
  };

/* resets the connection; can be reused for more requests */
void evhttp_connection_reset (struct evhttp_connection *);

/* connects if necessary */
int evhttp_connection_connect (struct evhttp_connection *);

/* notifies the current request that it failed; resets connection */
void evhttp_connection_fail (struct evhttp_connection *,
                             enum evhttp_connection_error error);

void evhttp_get_request (struct evhttp *, int, struct sockaddr *, socklen_t);

int evhttp_hostportfile (char *, char **, u_short *, char **);

int evhttp_parse_lines (struct evhttp_request *, struct evbuffer*);

void evhttp_start_read (struct evhttp_connection *);
void evhttp_read_header (int, short, void *);
void evhttp_make_header (struct evhttp_connection *, struct evhttp_request *);

void evhttp_write_buffer (struct evhttp_connection *,
                          void (*) (struct evhttp_connection *, void *), void *);

/* response sending HTML the data in the buffer */
void evhttp_response_code (struct evhttp_request *, int, const char *);
void evhttp_send_page (struct evhttp_request *, struct evbuffer *);

#endif /* _HTTP_H */
